WM_CAP_SET_PREVIEWRATE  7955OW 

The WM_CAP_SET_PREVIEWRATE message sets the frame display rate in preview mode. You can send this message explicitly or by using the capPreviewRate.PWZ.B macro.

WM_CAP_SET_PREVIEWRATE

wParam = (WPARAM) (wMS);

lParam = 0L;

 

Parameters

wMS

Rate, in milliseconds, at which new frames are captured and displayed.

 

Return Values

Returns TRUE if successful or FALSE if the capture window is not connected to a capture driver.

Remarks

The preview mode uses substantial CPU resources. Applications can disable preview or lower the preview rate when another application has the focus. During streaming video capture, the previewing task is lower priority than writing frames to disk, and preview frames are displayed only if no other buffers are available for writing.

See Also

capPreviewRate